what is hot spot?

[zzyzx]

I see people mention your photo has got hot spots? wat is hot spot? i only see a sticky thrad on causes of hot spot but it didn't mention wat is it...

[night86mare]

Originally Posted by zzyzx I see people mention your photo has got hot spots? wat is hot spot? i only see a sticky thrad on causes of hot spot but it didn't mention wat is it...

simply - a hot spot is something probably caused by diffraction, i presume you already know that

in some cases some lenses (on prosumer OR dslr lenses) tend to have hot spots - i.e. the centre of the picture has this funny ring that seems more exposed than the rest of the picture

something like reverse vignetting in the centre, if you get what i mean

[zzyzx]

i see... thanks...

[psccy]

you can see my thread about the hotspot issue...
http://forums.clubsnap.org/showthrea...ghlight=tokina
The photos show hotspot...

as they say, a picture tells a thousand words.

[LittleWolf]

Originally Posted by zzyzx I see people mention your photo has got hot spots? wat is hot spot? i only see a sticky thrad on causes of hot spot but it didn't mention wat is it...

It's a form of lens flare, made worse by the fact that electronic sensors are usually covered with a glass that gives specular reflections. Lens/sensor cover coatings which would reduce flare are designed for the visible spectral range. At IR wavelengths, they may not be that effective anymore.